A boiler concentrated water waste heat recovery system

Abstract

The present invention relates to the field of carbon disulfide production, and particularly relates to a waste heat recovery system for boiler concentrated water. It includes a blowdown flash tank, a first heat exchanger and a second heat exchanger. The blowdown flash tank is used to collect boiler concentrated water. The blowdown flash tank is provided with a steam outlet and a hot water outlet. The steam outlet is communicated with the first heat exchanger, and the hot water outlet is communicated with the second heat exchanger. The first heat exchanger and the second heat exchanger are used to heat the heating object, and the heating object includes demineralized water. It can fully recover the waste heat in the boiler concentrated water, greatly reduce energy waste, and is more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of carbon disulfide production, and more particularly, to a waste heat recovery system for concentrated boiler water. Background Art

[0002] During the production process of carbon disulfide, the temperature of the process gas in the reaction furnace is 650°C, and the temperature of the process gas in the sulfur-making furnace is 1205°C. To recover waste heat, the existing method is to set up two sulfur condensers, one economizer steam drum, and one waste heat recovery device. The shell layer of the heat exchange equipment is demineralized water, and the tube layer is process gas. During operation, regular and continuous sewage discharge is carried out. To ensure the clean discharge of boiler water, part of the superheated steam is mixed in the discharge process, and the temperature of the discharged concentrated water is about 180°C, and the discharge pressure is 0.35 MPa.

[0003] The current implementation plan is to discharge the boiler blowdown sewage into the circulating water tank, and the by-product steam during the process is discharged to a high place, resulting in a large amount of waste heat being wasted.

[0004] In view of this, the present application is specifically proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a waste heat recovery system for concentrated boiler water, which can fully recover the waste heat in the concentrated boiler water, greatly reduce energy waste, and is more environmentally friendly.

[0006] The embodiments of the present invention are implemented as follows:

[0007] A waste heat recovery system for concentrated boiler water includes: a blowdown flash tank, a first heat exchanger, and a second heat exchanger.

[0008] The blowdown flash tank is used to collect concentrated boiler water. The blowdown flash tank is provided with a steam outlet and a hot water outlet. The steam outlet is communicated with the first heat exchanger, and the hot water outlet is communicated with the second heat exchanger.

[0009] The first heat exchanger and the second heat exchanger are used to heat the heating object, and the heating object includes demineralized water.

[0010] Further, the first heat exchanger is a condensate flash cooler. The condensate outlet of the condensate flash cooler is communicated with a condensate collection tank and is transported to a deaerator through a transfer pump.

[0011] Further, the second heat exchanger is a plate heat exchanger. The concentrated boiler water outlet of the second heat exchanger is communicated with a sewage tank.

[0012] Further, the waste heat recovery system for concentrated boiler water further includes a dispensing mechanism and a plurality of demineralized water tanks for storing demineralized water.

[0013] The desalted water tanks are all provided with temperature detectors, which are all electrically connected to the allocation mechanism. The allocation mechanism is used to allocate desalted water between the desalted water tanks according to the required amount and required temperature of the desalted water, so that the desalted water in one or more desalted water tanks meets the required amount and required temperature of the desalted water.

[0014] Furthermore, the water inlet pipe of the desalted water tank is arranged along the height direction of the desalted water tank and extends from the bottom to the top of the desalted water tank.

[0015] The wall of the water inlet pipe is provided with a first water inlet, and a plurality of first water inlets are distributed at intervals along the axial direction of the water inlet pipe. A cover plate is provided inside the first water inlet, and the cover plate is slidably matched with the water inlet pipe along the radial direction of the water inlet pipe.

[0016] A water wheel rotor, a driving rod and a driving member are arranged in the water inlet pipe. The water wheel rotor and the driving rod are matched in transmission and are both arranged along the axial direction of the water inlet pipe, and the driving member is fixedly connected with the driving rod.

[0017] When water flows into the water inlet pipe, the water flow drives the water wheel, the driving member rotates along with the driving rod, and the cover plate is opened intermittently.

[0018] Furthermore, along the circumference of the water inlet pipe, the first water inlets are evenly spaced to form water inlet rings, and the plurality of water inlet rings are evenly spaced along the axial direction of the water inlet pipe.

[0019] Each water inlet ring is equipped with a driving member. When the driving member rotates with the driving rod, the first water inlets in the water inlet ring are intermittently opened one by one.

[0020] Furthermore, the plurality of driving members are staggered with respect to each other along the rotation direction of the driving members.

[0021] Furthermore, the water inlet pipe is also provided with a rebound ring and an elastic drawstring.

[0022] The rebound ring is arranged along the circumference of the water inlet ring. The rebound ring is provided with a clearance gap for making way for the cover plate. Guide rails are arranged on both side edges of the clearance gap. The guide rails are arranged along the sliding direction of the cover plate. Both sides of the cover plate can be slidably matched with the guide rails.

[0023] The rebound ring is a hollow structure, and the elastic pull rope is arranged inside the rebound ring. The elastic pull rope is connected between two adjacent cover plates along the circumference of the water inlet pipe. Multiple elastic pull ropes connect the cover plates corresponding to the water inlet ring into a ring.

[0024] The elastic drawstring is in an elastically stretched state so as to enable the cover plate to cover the first water inlet.

[0025] Furthermore, the driving member includes: a first arc segment, a transition segment and a second arc segment.

[0026] The radius of the circumference corresponding to the first arc segment is greater than the radius of the circumference corresponding to the second arc segment, and the first arc segment and the second arc segment are concentrically arranged. The transition segment is connected between the first arc segment and the second arc segment, and the first arc segment and the transition segment are symmetrically arranged at both ends of the second arc segment.

[0027] A fitting is fixedly connected to the inner side of the cover plate, and the fitting is provided with a fitting groove for cooperating with the driving member. When the first arc segment is fitted into the fitting groove, the cover plate covers the first water inlet. When the second arc segment is fitted into the fitting groove, the first water inlet is opened. The transition segment is used to guide the fitting between the first arc segment and the second arc segment.

[0028] Furthermore, the water inlet pipe is also provided with a second water inlet, and the inner diameter of the second water inlet is smaller than the inner diameter of the first water inlet. The second water inlets are provided at both the top of the water inlet pipe and the position of the water inlet pipe close to the bottom of the demineralized water tank.

[0029] The beneficial effects of the technical solution of the embodiment of the present invention include:

[0030] During the use of the boiler concentrated water waste heat recovery system provided by the embodiment of the present invention, along the axial and circumferential directions of the water inlet pipe, different first water inlets are alternately opened and closed, greatly improving the mixing efficiency between desalinated waters at different temperatures.

[0031] During the water inlet process, the first water inlets at different heights and different orientations on the water inlet pipe are sequentially and intermittently opened, and the incoming desalinated water can enter the desalinated water tank from different depths and different angles, effectively increasing the overall instability of the liquid phase in the desalinated water tank, effectively accelerating the heat transfer and balance, greatly improving the mixing efficiency of the desalinated water, facilitating the rapid stabilization of the temperature, and thus improving the mixing and blending efficiency of the desalinated water. In this process, no additional power source needs to be introduced, and the power of the water flow is directly utilized.

[0032] During the movement of the driving member, the flow area of the desalinated water is changing. With the desalinated water supply flow rate remaining unchanged, the water pressure and flow velocity at the second water inlet are constantly changing. This can further exacerbate the overall instability of the liquid phase in the desalinated water tank, strengthen the disturbance inside the liquid phase, further accelerate the heat transfer and balance, and optimize the mixing efficiency.

[0033] Generally speaking, the boiler concentrated water waste heat recovery system provided by the embodiment of the present invention can fully recover the waste heat in the boiler concentrated water, greatly reducing energy waste and being more environmentally friendly. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of a boiler concentrated water waste heat recovery system provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the overall structure of a desalted water tank of a boiler concentrated water waste heat recovery system provided in an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of the top of the water inlet pipe of the desalted water tank of the boiler concentrated water waste heat recovery system provided in an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of the bottom end of the water inlet pipe of the desalted water tank of the boiler concentrated water waste heat recovery system provided in an embodiment of the present invention;

[0039] Figure 5 is a schematic structural diagram of the first water inlet of the water inlet pipe;

[0040] Figure 6 for Figure 5 A partial enlarged view of

[0041] Figure 7 It is a schematic diagram of the structure at the clearance gap of the rebound ring;

[0042] Figure 8 is a schematic diagram of a state when the first water inlet is in an open state;

[0043] Figure 9 It is a schematic diagram of the cooperation between the driving member and the driving rod;

[0044] Figure 10 is a schematic diagram of the structure of the driving member;

[0045] Figure 11 It is a schematic diagram of the first state of the first water inlet circle;

[0046] Figure 12 is a schematic diagram of a first state of the second water inlet circle;

[0047] Figure 13 is a schematic diagram of the first state of the third water inlet circle;

[0048] Figure 14 is a schematic diagram of the second state of the first water inlet circle;

[0049] Figure 15 Schematic diagram of the second state of the second water inlet ring;

[0050] Figure 16 Schematic diagram of the second state of the third water inlet ring.

[0051] Explanation of reference numerals:

[0052] Boiler concentrated water waste heat recovery system 2000; blowdown flash tank 2100; first heat exchanger 2200; second heat exchanger 2300; demineralized water tank 1000; water inlet pipe 100; first water inlet 110; water inlet ring 120; cover plate 130; fitting 140; fitting groove 141; second water inlet 150; water wheel 210; drive shaft 220; drive gear 230; transmission gear 240; rotating ring 250; drive rod 260; drive member 300; first arc section 310; transition section 320; second arc section 330; connecting rod 340; resilient ring 400; relief notch 410; extension notch 420; guide rail 430; first rail body 431; second rail body 432; elastic cord 500. Detailed implementation manners

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0056] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0057] In addition, terms such as "parallel" and "perpendicular" do not mean that the components are required to be absolutely parallel or perpendicular, but can be slightly inclined. For example, "parallel" only means that its direction is more parallel relative to "perpendicular", and does not mean that the structure must be completely parallel, but can be slightly inclined.

[0058] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Embodiment

[0060] Please refer to Figure 1 , this embodiment provides a boiler concentrated water waste heat recovery system 2000. The boiler concentrated water waste heat recovery system 2000 includes: a blowdown flash tank 2100, a first heat exchanger 2200, and a second heat exchanger 2300.

[0061] The blowdown flash tank 2100 is used to collect the boiler concentrated water, for example, to collect the boiler concentrated water of a sulfur condenser, an economizer steam drum, a waste heat recovery device, etc.

[0062] The blowdown flash tank 2100 is provided with a steam outlet and a hot water outlet. The steam outlet is communicated with the first heat exchanger 2200, and the hot water outlet is communicated with the second heat exchanger 2300.

[0063] The generated boiler concentrated water enters the blowdown flash tank 2100. When the boiler concentrated water is discharged into the blowdown flash tank 2100, the volume expands, the pressure decreases, and at the same time the saturation temperature also decreases accordingly. In this way, a large amount of steam is released from the blowdown water under the original pressure after the pressure decreases.

[0064] This part of the vaporized steam is introduced into the first heat exchanger 2200, so that the heat of this part of the steam can be recovered. And the hot water in the blowdown flash tank 2100 can be introduced into the second heat exchanger 2300, so as to recover the waste heat of the hot water.

[0065] The first heat exchanger 2200 and the second heat exchanger 2300 are used to heat the heating object, and the heating object includes but is not limited to demineralized water.

[0066] In this embodiment, the first heat exchanger 2200 is a condensate flash cooler. The condensate outlet of the condensate flash cooler is communicated with a condensate collection tank and is transported to a deaerator through a transfer pump. The second heat exchanger 2300 is a plate heat exchanger, and the boiler concentrated water outlet of the second heat exchanger 2300 is communicated with a sewage tank.

[0067] The first heat exchanger 2200 and the second heat exchanger 2300 can recover the waste heat and use it to heat the demineralized water, but not limited to this.

[0068] Furthermore, please combine Figures 1 to 10, the boiler concentrated water waste heat recovery system 2000 further includes a dispensing mechanism and a number of demineralized water tanks 1000. The demineralized water tanks 1000 are used to store demineralized water, and the demineralized water tanks 1000 are all connected to the dispensing mechanism.

[0069] Each of the demineralized water tanks 1000 is provided with a temperature detector (not shown in the figure) and a water level detector (not shown in the figure). The temperature detector is used to detect the temperature of the demineralized water in each demineralized water tank 1000, and the water level detector is used to detect the water level height of the demineralized water in each demineralized water tank 1000, so as to know the amount of water in each demineralized water tank 1000. It can be understood that the acquisition methods of temperature and water volume are not limited to this.

[0070] Both the temperature detector and the water level detector are electrically connected to the dispensing mechanism.

[0071] The dispensing mechanism is used to dispense demineralized water among the demineralized water tanks 1000 according to the demineralized water demand and the required temperature, so that the demineralized water in one or more demineralized water tanks 1000 meets the demineralized water demand and the required temperature.

[0072] For example, currently 10 cubic meters of demineralized water at 25°C is needed, and the capacity of each demineralized water tank 1000 is assumed to be 2 cubic meters. The dispensing mechanism can dispense the demineralized water according to the water volume and water temperature in each demineralized water tank 1000 to dispense 10 cubic meters of demineralized water at 25°C. Generally speaking, the demineralized water heated by the first heat exchanger 2200 and the second heat exchanger 2300 has a higher temperature. By mixing the low-temperature and high-temperature demineralized water in proportion, demineralized water at the required temperature can be obtained. And it is not limited to this.

[0073] In order to be able to accelerate the temperature stabilization speed of the demineralized water during the dispensing process and improve the mixing efficiency of the demineralized water at different temperatures, the demineralized water tank 1000 has also been improved.

[0074] Specifically, the water inlet pipe 100 of the demineralized water tank 1000 is arranged along the height direction of the demineralized water tank 1000 and extends from the bottom to the top of the demineralized water tank 1000. The water inlet pipe 100 is coaxially arranged with the demineralized water tank 1000.

[0075] The pipe wall of the water inlet pipe 100 is provided with a first water inlet 110. The opening direction of the first water inlet 110 is along the radial direction of the water inlet pipe 100, and a plurality of first water inlets 110 are spaced apart along the axial direction of the water inlet pipe 100.

[0076] Along the circumferential direction of the water inlet pipe 100, the first water inlets 110 are evenly spaced to form a water inlet ring 120, and a plurality of water inlet rings 120 are evenly spaced along the axial direction of the water inlet pipe 100.

[0077] A cover plate 130 is provided inside the first water inlet 110. Along the radial direction of the water inlet pipe 100, the cover plate 130 is slidably fitted to the water inlet pipe 100.

[0078] The water inlet pipe 100 is provided with a water wheel 210, a driving rod 260 and a driving member 300. The water wheel 210 and the driving rod 260 are in transmission cooperation and are both arranged along the axial direction of the water inlet pipe 100, and the driving member 300 is fixedly connected to the driving rod 260.

[0079] When the water inlet pipe 100 intakes water, the water flow drives the water wheel 210, the driving member 300 rotates with the driving rod 260, and intermittently opens the cover plate 130.

[0080] Through the above design, along the axial and circumferential directions of the water inlet pipe 100, different first water inlets 110 are alternately opened and closed, greatly improving the mixing efficiency between desalted water at different temperatures.

[0081] Among them, the water wheel 210 is arranged at the bottom end of the water inlet pipe 100, the rotation axis line of the water wheel 210 coincides with the central axis of the water inlet pipe 100, the water wheel 210 is in transmission cooperation with a driving shaft 220, the driving shaft 220 is coaxially arranged with the water inlet pipe 100, the driving shaft 220 extends to the top end of the water inlet pipe 100 and is rotatably fitted to the top wall of the water inlet pipe 100. The driving shaft 220 is coaxially and fixedly connected with a driving gear 230, the inner top wall of the water inlet pipe 100 is rotatably provided with a transmission gear 240 and a rotating ring 250, the rotating ring 250 has an internal gear ring, the rotating ring 250 is coaxially arranged with the driving shaft 220, the transmission gear 240 is arranged between the rotating ring 250 and the driving gear 230, and both the rotating ring 250 and the driving gear 230 are engaged with the transmission gear 240.

[0082] The driving rod 260 is arranged parallel to and at an interval from the driving shaft 220, the driving rod 260 is fixedly connected to the rotating ring 250, a plurality of driving rods 260 are evenly spaced along the circumferential direction of the rotating ring 250, and the driving rod 260 extends towards the bottom end of the water inlet pipe 100.

[0083] Each water inlet ring 120 is provided with a driving member 300 in cooperation. When the driving member 300 rotates with the driving rod 260, the first water inlets 110 in the water inlet ring 120 are intermittently opened one by one.

[0084] Specifically in this embodiment, the water inlet pipe 100 is further provided with a resilient ring 400 and an elastic pull rope 500.

[0085] The resilient ring 400 is arranged circumferentially along the water inlet ring 120, and the resilient ring 400 is of a hollow structure. The resilient ring 400 is provided with a relief notch 410 for making way for the cover plate 130, and the relief notch 410 interrupts the resilient ring 400. Guide rails 430 are provided at both side edges of the relief notch 410, the guide rails 430 are arranged along the sliding direction of the cover plate 130, and both sides of the cover plate 130 are slidably engaged with the guide rails 430 respectively. Along the length direction of the guide rail 430, the cover plate 130 is slidably engaged with the guide rail 430; along the width direction of the guide rail 430, the cover plate 130 is fixedly engaged with the guide rail 430.

[0086] The elastic pull cord 500 is arranged inside the resilient ring 400, and an elastic pull cord 500 is arranged between every two adjacent relief notches 410 along the circumferential direction of the water inlet pipe 100.

[0087] The elastic pull cord 500 is connected between two adjacent cover plates 130, the elastic pull cord 500 is connected to the side edge of the cover plate 130, and multiple elastic pull cords 500 connect the cover plates 130 corresponding to the water inlet ring 120 into a ring, that is, multiple cover plates 130 and elastic pull cords 500 of the same water inlet ring 120 are connected to each other to form a closed-loop structure.

[0088] The elastic pull cord 500 is in an elastically stretched state. In the natural state, the elastic pull cord 500 provides an elastic pulling force for sliding the cover plate 130 along the guide rail 430 towards the first water inlet 110 and covering the first water inlet 110, so as to close the first water inlet 110.

[0089] The guide rail 430 includes a first rail body 431 and a second rail body 432 which are arranged in parallel and at intervals, and the first rail body 431 and the second rail body 432 are arranged at intervals along the axial direction of the water inlet pipe 100. The side edge of the cover plate 130 is slidably engaged between the first rail body 431 and the second rail body 432, and the elastic pull cord 500 passes through the gap between the first rail body 431 and the second rail body 432 and is connected to the cover plate 130.

[0090] Both sides of the relief notch 410 further have extension notches 420, the extension notches 420 extend along the resilient ring 400, and the extension notches 420 are located on the side of the resilient ring 400 close to the central axis of the water inlet pipe 100. The extension notches 420 facilitate the elastic pull cord 500 to extend towards the cover plate 130, and can also reduce the bending degree of the elastic pull cord 500 and reduce the wear of the elastic pull cord 500.

[0091] Further, the driving member 300 includes: a first arc segment 310, a transition segment 320, and a second arc segment 330.

[0092] The radius of the circumference corresponding to the first arc segment 310 is greater than the radius of the circumference corresponding to the second arc segment 330, and the first arc segment 310 and the second arc segment 330 are concentrically arranged. The transition segment 320 is connected between the first arc segment 310 and the second arc segment 330, and the first arc segment 310 and the transition segment 320 are symmetrically arranged at both ends of the second arc segment 330. The connecting parts of both the first arc segment 310 and the second arc segment 330 with the transition segment 320 are smoothed.

[0093] A fitting 140 is fixedly connected to the inner side of the cover plate 130. The fitting 140 is provided with a fitting groove 141 for fitting with the driving member 300, and the opening of the fitting groove 141 faces the side where the central axis of the water inlet pipe 100 is located.

[0094] When the first arc segment 310 fits into the fitting groove 141, the cover plate 130 covers the first water inlet 110. When the second arc segment 330 fits into the fitting groove 141, the first water inlet 110 is opened. The transition segment 320 is used to guide the fitting 140 between the first arc segment 310 and the second arc segment 330. The driving member 300 is arranged along the circumferential direction of the water inlet pipe 100, and the driving member 300 and the driving rod 260 are fixedly connected through a connecting rod 340. The diameters of both the driving member 300 and the connecting rod 340 are smaller than the distance between the first rail body 431 and the second rail body 432.

[0095] It should be noted that during the movement of the driving member 300 along with the driving rod 260, the driving member 300 can only drive one cover plate 130 of the corresponding water inlet ring 120 to open at the same time.

[0096] Among them, the driving members 300 of different water inlet rings 120 are mutually offset along the rotation direction of the driving member 300. In this embodiment, the water inlet rings 120 are set to 3, and the number of the first water inlets 110 of each water inlet ring 120 is 4, but it is not limited thereto. Here, we set that among the 4 first water inlets 110 of each water inlet ring 120, the first water inlet 110 at the twelve o'clock direction is No. 1, and they are sequentially No. 2, No. 3, and No. 4 in the clockwise direction.

[0097] The specific working process is as follows (only for illustrative purposes, not limited thereto): When the No. 4 first water inlet 110 of the first water inlet ring 120 is opened (as Figure 11 shown), the No. 1 first water inlet 110 of the second water inlet ring 120 is opened (as Figure 12 shown), and all the first water inlets 110 of the third water inlet ring 120 are in the closed state (as Figure 13As shown. Among them, as the driving member 300 continues to move, the No. 4 first water inlet 110 of the first water inlet ring 120 is about to be closed, the No. 1 first water inlet 110 of the second water inlet ring 120 is in the just-opened state, and the No. 2 first water inlet 110 of the third water inlet ring 120 is about to be opened.

[0098] As the driving member 300 continues to move, the No. 4 first water inlet 110 of the first water inlet ring 120 is closed (as Figure 14 shown), and all the first water inlets 110 of the first water inlet ring 120 are closed. The No. 1 first water inlet 110 of the second water inlet ring 120 is still in the open state and is about to be closed next (as Figure 15 shown). The No. 2 first water inlet 110 of the third water inlet ring 120 is opened and is in the just-opened state (as Figure 16 shown).

[0099] When the driving member 300 continues to move, the opening and closing states of the first water inlets 110 of each water inlet ring 120 change according to this rule.

[0100] Among them, when the driving member 300 drives the cover plate 130, both the driving member 300 and the connecting rod 340 act on the cover plate 130 through the gap between the first rail body 431 and the second rail body 432.

[0101] Through this design, during the water inlet process, the first water inlets 110 at different heights and different orientations on the water inlet pipe 100 are intermittently opened in sequence, and the incoming demineralized water can enter the demineralized water tank 1000 from different depths and different angles, which can effectively increase the overall instability of the liquid phase in the demineralized water tank 1000, effectively accelerate the heat transfer and balance, greatly improve the mixing efficiency of the demineralized water, facilitate the rapid stabilization of the temperature, and thus improve the mixing and blending efficiency of the demineralized water. During this process, no additional power source needs to be introduced, and the power of the water flow is directly utilized.

[0102] In this embodiment, the water inlet pipe 100 is also provided with a second water inlet 150, and the inner diameter of the second water inlet 150 is smaller than the inner diameter of the first water inlet 110. The second water inlets 150 are provided at both the top of the water inlet pipe 100 and the position of the water inlet pipe 100 close to the bottom of the demineralized water tank 1000.

[0103] Through this design, the second water inlet 150 can ensure that the water inlet channel is always in the open state, so that the incoming water flow can flow smoothly. In this way, it is ensured that the water flow can smoothly drive the water wheel runner 210, thereby realizing the control of each water inlet ring 120 by the driving member 300.

[0104] On this basis, as the first water inlets 110 with different heights and orientations are intermittently opened in sequence, to a certain extent, it will affect the water pressure at the second water inlet 150, which is also conducive to increasing the overall instability of the liquid phase in the demineralized water tank 1000 and further accelerating the heat transfer and balance.

[0105] It should be noted that the following effects can also be achieved by adjusting the radian of the first arc segment 310, the transition segment 320, and the second arc segment 330: during the movement of the driving member 300, the first water inlets 110 are alternately opened, and there is a state where all the first water inlets 110 are simultaneously closed. In this way, during the movement of the driving member 300, the flow area of the demineralized water changes. With the demineralized water supply flow rate remaining unchanged, the water pressure and flow rate at the second water inlet 150 are constantly changing. This can further exacerbate the overall instability of the liquid phase in the demineralized water tank 1000, strengthen the disturbance inside the liquid phase, further accelerate the heat transfer and balance, and optimize the mixing efficiency.

[0106] In summary, the boiler concentrated water waste heat recovery system 2000 provided by the embodiment of the present invention can fully recover the waste heat in the boiler concentrated water, greatly reducing energy waste and being more environmentally friendly. This technical solution makes full use of the waste heat of the boiler concentrated water to maximize the energy utilization, avoids discharging the concentrated water into the circulating water tank to affect the quality of the circulating water, and avoids the increase in the temperature of the circulating water, thereby greatly reducing the makeup water volume of the circulating water.

[0107] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A boiler concentrated water waste heat recovery system, characterized in that, include: A blowdown expansion tank, a first heat exchanger and a second heat exchanger; The blowdown expansion tank is used to collect concentrated water from the boiler. The blowdown expansion tank is provided with a steam outlet and a hot water outlet. The steam outlet is communicated with the first heat exchanger, and the hot water outlet is communicated with the second heat exchanger. The first heat exchanger and the second heat exchanger are used to heat a heating object, and the heating object includes desalted water; The boiler concentrated water waste heat recovery system also includes a mixing mechanism and a plurality of desalted water tanks, wherein the desalted water tanks are used to store desalted water; The desalted water tanks are all provided with temperature detectors, and the temperature detectors are all electrically connected to the allocation mechanism; the allocation mechanism is used to allocate desalted water between the desalted water tanks according to the required amount of desalted water and the required temperature, so that the desalted water in one or more desalted water tanks meets the required amount of desalted water and the required temperature; The water inlet pipe of the desalted water tank is arranged along the height direction of the desalted water tank and extends from the bottom to the top of the desalted water tank; The water inlet pipe has a first water inlet on its wall, and a plurality of the first water inlets are spaced apart along the axial direction of the water inlet pipe; a cover plate is provided on the inner side of the first water inlet, and the cover plate is slidably matched with the water inlet pipe along the radial direction of the water inlet pipe; The water inlet pipe is provided with a water wheel rotor, a driving rod and a driving member; the water wheel rotor and the driving rod are in transmission cooperation and are both arranged along the axial direction of the water inlet pipe, and the driving member is fixedly connected to the driving rod; When water flows into the water inlet pipe, the water flow drives the water wheel, the driving member rotates along with the driving rod, and the cover plate is opened intermittently; Along the circumference of the water inlet pipe, the first water inlets are evenly spaced to form a water inlet ring, and a plurality of the water inlet rings are evenly spaced along the axial direction of the water inlet pipe; Each of the water inlet rings is provided with a driving member, and when the driving member rotates with the driving rod, the first water inlets in the water inlet rings are intermittently opened one by one; The water inlet pipe is also provided with a rebound ring and an elastic draw cord; The rebound ring is arranged along the circumference of the water inlet ring, and the rebound ring is provided with a clearance notch for making way for the cover plate. Guide rails are arranged on both side edges of the clearance notch, and the guide rails are arranged along the sliding direction of the cover plate. Both sides of the cover plate are slidably matched with the guide rails respectively; The elastic ring is a hollow structure, the elastic drawstring is arranged inside the elastic ring, and along the circumference of the water inlet pipe, the elastic drawstring is connected between two adjacent cover plates, and a plurality of the elastic drawstrings connect the cover plates corresponding to the water inlet ring into a ring; The elastic drawstring is in an elastically stretched state so as to enable the cover plate to cover the first water inlet.

2. The boiler concentrated water waste heat recovery system according to claim 1, characterized in that, The first heat exchanger is a condensate flash cooler, and the condensate outlet of the condensate flash cooler is connected to the condensate collection tank and is transported to the deaerator through a delivery pump.

3. The boiler concentrated water waste heat recovery system according to claim 1, characterized in that, The second heat exchanger is a plate heat exchanger, and the boiler concentrated water outlet of the second heat exchanger is connected to the sewage tank.

4. The boiler concentrated water waste heat recovery system according to claim 1, characterized in that, The plurality of driving members are mutually staggered along the rotation direction of the driving members.

5. The boiler concentrated water waste heat recovery system according to claim 1, characterized in that, The driving member comprises: a first arc segment, a transition segment and a second arc segment; The radius of the circumference corresponding to the first arc segment is greater than the radius of the circumference corresponding to the second arc segment, and the first arc segment and the second arc segment are concentrically arranged; the transition segment is connected between the first arc segment and the second arc segment, and the first arc segment and the transition segment are symmetrically arranged at both ends of the second arc segment; A fitting is fixedly connected to the inner side of the cover plate, and the fitting is provided with a fitting groove for cooperating with the driving member; when the first arc segment is fitted into the fitting groove, the cover plate covers the first water inlet; when the second arc segment is fitted into the fitting groove, the first water inlet is opened; the transition segment is used to guide the fitting between the first arc segment and the second arc segment.

6. The boiler concentrated water waste heat recovery system according to claim 5, characterized in that, The water inlet pipe is further provided with a second water inlet, and the inner diameter of the second water inlet is smaller than the inner diameter of the first water inlet; the second water inlet is provided at both the top of the water inlet pipe and the position of the water inlet pipe close to the bottom of the demineralized water tank.

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